I know, that the Optitrack Baseline 2D SDK is a retired product, why I don't expect any support, but maybe someone knows a solution for my problem:

I have written a small Application with the latest SDK, which works great with my TrackIR5-Camera (111459). Now, trying the same application with another TrackIR5-Camera (157422) fails. The Camera is not responding, none of the lights lit on startup. Both Cameras work flawless with the TrackIR Software 5.1 though.

Out of curiosity, is there any particular reason for mentioning the older SDK? If the application was compiled with that SDK, it's drivers, or DLLs, it's entirely possible that the new TrackIR won't work with it, as a change was made requiring new software around for any device with a serial past 155662.

If it was compiled with the latest Camera SDK then there shouldn't be an issue where an older TrackIR worked, but a newer one did not.

The Application was written with the Baseline 2D SDK, because it made use of the Vector-Clip.
Since I don't know how many changes would be needed to replace the Baseline 2D SDK with the Camera SDK, I didn't yet consider doing so.

The latest version of the Camera SDK will work with the newer TrackIR 5 devices, as well as the vector clip and TrackClip Pro. SDK versions released previous to december of 2010 will not function with the newer TrackIR 5 cameras, so upgrading would probably be advisable at this point.